CN103675340B - The optical fiber acceleration meter of a kind of differential type bigrating structures - Google Patents
The optical fiber acceleration meter of a kind of differential type bigrating structures Download PDFInfo
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- CN103675340B CN103675340B CN201310712441.XA CN201310712441A CN103675340B CN 103675340 B CN103675340 B CN 103675340B CN 201310712441 A CN201310712441 A CN 201310712441A CN 103675340 B CN103675340 B CN 103675340B
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Abstract
The present invention relates to the optical fiber acceleration meter of a kind of differential type bigrating structures, comprise shell, quality block, tunable screw, fixing base plate, fixed block, elasticity sheet and fiber grating, two quality blocks wherein all have pickup groove and symmetrical placement up and down, two fixed blocks also all have pickup groove and symmetrical placement up and down, one end of two fiber gratings is individually fixed in the pickup groove of two quality blocks, and the other end is individually fixed in the pickup groove of two fixed blocks and passes from pickup groove; Fixed block and quality block are connected by elasticity sheet, fixed block is installed on solid roof and floor, quality block is unsettled, shell is fixedly connected with solid roof and floor and seals, two tunable screws are each passed through shell and fixing base plate confrontation gauge block carries out spacing, this optical fiber acceleration is avoided by the situation that press polish grid export without strain in respect of effect, it is to increase the measurement accuracy of optical fiber acceleration meter, avoid the damage of optical fiber acceleration meter simultaneously, enhance the intensity of fiber grating.
Description
Technical field
The present invention relates to and a kind of utilize fiber grating as the optical fiber acceleration meter of sensor, especially relate to the optical fiber acceleration meter of a kind of differential type bigrating structures.
Background technology
Optical fiber acceleration meter is the novel jerkmeter detecting displacement principle based on optical signalling. Optical fiber acceleration meter can realize photodetachment, and namely sensing head and signal deteching circuit separate completely, has the feature of electromagnetism interference and remote measurement. Except acceleration is measured, optical fiber acceleration meter also can be used for the network monitoring of structural vibration, and monitoring instruction and distant early warning.
Utilizing fiber grating as the optical fiber acceleration meter of sensor, measuring acceleration converts the displacement of quality block to by treating to adopt socle girder and quality block, and the strain caused by the responsive displacement of fiber grating, has the advantage that signal detecting method is simple, precision is higher. For the impact that acceleration is measured by envrionment temperature, develop differential optical fiber jerkmeter. Two symmetrical fiber gratings installed are adopted to carry out the displacement of measurement quality block; When quality block under acceleration effect produces displacement, the strain of two fiber gratings of symmetrical fixed installation is equal with wavelength change size, direction is contrary; When variation of ambient temperature, the wavelength change size of two fiber gratings is equal, direction is identical; Relatively change, by the wavelength measured between symmetrical two fiber gratings fixedly mounted, the size that just can measure acceleration, the impact of variation of ambient temperature can also be suppressed simultaneously.
Existing utilize fiber grating as the optical fiber acceleration meter of sensor, the range of optical fiber acceleration meter is limited to the ability of the tensile strength that fiber grating can bear, and will improve the tensile resistance of fiber grating to obtain the optical fiber acceleration meter of relatively large journey; If the acceleration loaded is excessive, the fiber grating being arranged on quality block can be produced relatively large sstrain, once exceed the strain limit that fiber grating can bear, fiber grating can be caused to be pulled off and damage with optical fiber acceleration meter. Meanwhile, the installation mode of 2 the fixing fiber gratings adopted at present can occur the situation that the fiber grating pressed exports without strain when there being acceleration to load, and this brings bigger problem to Measurement accuracy.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, the optical fiber acceleration meter of a kind of differential type bigrating structures is provided, this optical fiber acceleration is avoided by the situation that press polish grid export without strain in respect of effect, improve the measurement accuracy of optical fiber acceleration meter, avoid the damage of optical fiber acceleration meter simultaneously, enhance the intensity of fiber grating, and improve the reliability of optical fiber acceleration meter.
The above-mentioned purpose of the present invention is mainly achieved by following technical solution:
The optical fiber acceleration meter of a kind of differential type bigrating structures, comprise shell, two quality blocks, two tunable screws, fixing base plate, two fixed blocks, elasticity sheet and two fiber gratings, wherein two quality blocks all have pickup groove, and symmetrical placement up and down, two fixed blocks also all have pickup groove, and symmetrical placement up and down, one end of two fiber gratings is individually fixed in the pickup groove of two quality blocks, and the other end is individually fixed in the pickup groove of two fixed blocks and passes from described pickup groove; Fixed block and quality block are connected by elasticity sheet, fixed block is installed on solid roof and floor, quality block is unsettled, shell is fixedly connected with solid roof and floor and quality block, fixed block and elasticity sheet is sealed wherein, one end of two fiber gratings is through shell and outwards stretches out, and two tunable screws are each passed through shell and fixing base plate is confronted gauge block and carried out spacing.
In the optical fiber acceleration meter of above-mentioned differential type bigrating structures, the outside surface of two fiber gratings is provided with overlay, and the thickness of overlay is 50��100 ��m.
In the optical fiber acceleration meter of above-mentioned differential type bigrating structures, the overlay of two fiber grating outside surfaces is polyimide material.
In the optical fiber acceleration meter of above-mentioned differential type bigrating structures, two tunable screws are separately fixed on shell and fixing base plate corresponding to the position of quality block, and the diameter of tunable screw is greater than the width of the pickup groove installing fiber grating on quality block.
In the optical fiber acceleration meter of above-mentioned differential type bigrating structures, the spacing range between tunable screw and quality block is 0��0.5mm.
In the optical fiber acceleration meter of above-mentioned differential type bigrating structures, fiber grating has carried out prestrain loading when mounted, and adopts bonded adhesives to be fixed at the two ends of fiber grating.
The present invention compared with prior art has following useful effect:
(1), the inventive design optical fiber acceleration meter of a kind of brand-new differential type bigrating structures, by utilizing quality block upper and lower displacement amplitude in adjustment screw limit fibre jerkmeter, the fiber grating strain is avoided to exceed the work strain scope of permission and cause optical fiber acceleration meter to damage, it is to increase the reliability of optical fiber acceleration meter; In addition by the spacing between set screw termination and quality block so that working method is simple, and technical difficulty is less, the technical difficulty that design complex mechanical structure brings is reduced;
(2), the optical fiber acceleration meter of the differential type bigrating structures of the present invention is by carrying out polyimide coating on fiber grating surface, and applied thickness is optimized, its tensile resistance is enhanced, further enhancing the intensity of fiber grating, and substantially increase range and the security of optical fiber acceleration meter;
(3), the optical fiber acceleration meter of the differential type bigrating structures of the present invention by it being loaded when fiber grating is installed a certain amount of prestrain, the situation about exporting without strain by press polish grid effectively avoided, it is to increase the measurement accuracy of optical fiber acceleration meter.
Accompanying drawing explanation
Fig. 1 is the side-view of the optical fiber acceleration meter of differential type bigrating structures of the present invention;
Fig. 2 is the structure front view of the optical fiber acceleration meter of differential type bigrating structures of the present invention;
Fig. 3 is tunable screw confrontation gauge block position-limiting action schematic diagram after the optical fiber acceleration meter of differential type bigrating structures of the present invention removes base plate and shell;
Fig. 4 is the schematic diagram that the sensitive optical fibre grating in the optical fiber acceleration meter of differential type bigrating structures of the present invention carries out polyimide coating;
Fig. 5 is the installation of the sensitive optical fibre grating in the optical fiber acceleration meter of differential type bigrating structures of the present invention and the loading schematic diagram of prestrain;
Description of reference numerals:
1 ... shell, 2 ... quality block, 3 ... tunable screw, 4 ... Gu roof and floor, 5 ... fixed block, 6 ... elasticity sheet, 7 ... fiber grating, 8 ... polyimide coating layer, 9 ... bonded adhesives
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
It is illustrated in figure 1 the side-view of the optical fiber acceleration meter of differential type bigrating structures of the present invention, Fig. 2 show the structure front view of the optical fiber acceleration meter of differential type bigrating structures of the present invention, the optical fiber acceleration meter of differential type bigrating structures of the present invention comprises shell 1 as seen from the figure, two quality blocks 2, two tunable screws 3, fixing base plate 4, two fixed blocks 5, elasticity sheet 6 and two fiber gratings 7, two quality blocks 2 wherein all have pickup groove and symmetrical placement up and down, two fixed blocks 5 also all have pickup groove and symmetrical placement up and down, one end of two fiber gratings 7 is individually fixed in the pickup groove of two quality blocks 2, the other end is individually fixed in the pickup groove of two fixed blocks 5 and passes from pickup groove. fixed block 5 and quality block 2 are connected by elasticity sheet 6, and fixed block 5 is installed on solid roof and floor 4, and quality block 2 is freely unsettled.
Shell 1 is mechanically connected with solid roof and floor 4 and seals wherein by quality block 2, fixed block 5 and elasticity sheet 6, and one end of two fiber gratings 7 is through shell 1 and outwards stretches out, and two tunable screws 3 are each passed through shell 1 and fixing base plate 4 is confronted gauge block 2 and carried out spacing.
The optical fiber acceleration meter being illustrated in figure 3 differential type bigrating structures of the present invention remove base plate and shell after tunable screw confrontation gauge block position-limiting action schematic diagram, the position corresponding to quality block 2 at fixing base plate 4 and shell 1 arranges a threaded hole respectively, for avoiding breaking grating, the diameter being screwed into the tunable screw 3 of threaded hole is greater than the width of the pickup groove installing fiber grating 7 on quality block 2, and the spacing range between tunable screw 3 and quality block 2 is 0��0.5mm. By the spacing between tunable screw 3 termination and quality block 2 end face, Mass Control block 2 can the amplitude of upper and lower displacement, the strain of limit fibre grating 7 is no more than its work strain scope and causes optical fiber acceleration meter to damage, and also achieves the tunable of optical fiber acceleration metering journey simultaneously.
Such as optical fiber acceleration meter of the present invention adopt work strain scope 0��5000 �� �� fiber grating 7 as sensor, when acceleration 10g the displacement of quality block 2 be 0.25mm, fiber grating 7 strain be 2500 �� ��; By tunable screw 3, the displacement amplitude of quality block is limited in 0.25mm, has namely protected the range of 10g, again the strain of fiber grating 7 is limited in 0��2500 �� ��, ensure that the trouble-free service of fiber grating 7.
The sensitive optical fibre grating being illustrated in figure 4 in the optical fiber acceleration meter of differential type bigrating structures of the present invention carries out the schematic diagram of polyimide coating, the outside surface of two fiber gratings 7 is provided with overlay 8, such as overlay 8 is polyimide material, and the thickness of overlay 8 is 50-100 ��m. Method is dipped in the present invention's employing or settling process evenly applies one layer of polyimide material at uncoated ordinary optic fibre grating surface, stretch-resistance through the fiber grating 7 of coating can be able to improve a lot than the fiber grating of uncoated or common coating, its strain energy that can bear has brought up to 10000 �� ��, work strain scope is 0��5000 �� ��, and this security both having added optical fiber acceleration meter also improves the range of optical fiber acceleration meter simultaneously.
The installation of the sensitive optical fibre grating being illustrated in figure 5 in the optical fiber acceleration meter of differential type bigrating structures of the present invention and the loading schematic diagram of prestrain, fiber grating 7 has carried out prestrain loading when mounted, and adopts stickup glue 9 to be fixed at the two ends of fiber grating 7.
Sensitive optical fibre grating 7 in optical fiber acceleration meter of the present invention is arranged in the pickup groove of quality block 2 and fixed block 5, when installing fiber grating 7, the prestrain that fiber grating 7 is applied with fixed value is so that ensure can effective normal operation at certain useful range inner fiber grating 7. Installation process is: first adopt the bonded adhesives 9 of high elastic coefficient and high adhesion energy that one end of fiber grating 7 is fixed; After bonded adhesives 9 has solidified, then by the other end of stretching optical fiber grating 7, it being loaded prestrain, it is relevant that the size being loaded prestrain bears strain intensity with fiber grating 7; While loading strain, with bonded adhesives 9, the other end of fiber grating is fixed stickup; The strain that removal loads after bonded adhesives 9 solidifies, in order to improve reliability, affixed points has carried out Redundancy Design, and namely the often end of fiber grating has two point of fixity, as shown in Figure 5. Because fiber grating 7 has been fixed when strained stretching, even if so loaded strain and remove, also remain the prestrain applied between two point of fixity, so successfully achieve the installation to fiber grating 7 and prestrain loading.
The above; the embodiment being only the best of the present invention, but protection scope of the present invention is not limited thereto, any is familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
The content not being described in detail in specification sheets of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (6)
1. the optical fiber acceleration meter of a differential type bigrating structures, it is characterized in that: comprise shell (1), two quality blocks (2), two tunable screws (3), fixing base plate (4), two fixed blocks (5), elasticity sheet (6) and two fiber gratings (7), wherein two quality blocks (2) all have pickup groove, and symmetrical placement up and down, two fixed blocks (5) also all have pickup groove, and symmetrical placement up and down, one end of two fiber gratings (7) is individually fixed in the pickup groove of two quality blocks (2), the other end is individually fixed in the pickup groove of two fixed blocks (5) and passes from described pickup groove, fixed block (5) and quality block (2) are connected by elasticity sheet (6), fixed block (5) is installed on fixing base plate (4), quality block (2) is unsettled, shell (1) is fixedly connected with fixing base plate (4) and quality block (2), fixed block (5) and elasticity sheet (6) is sealed wherein, one end of two fiber gratings (7) is through shell (1) and outwards stretches out, and two tunable screws (3) are each passed through shell (1) and fixing base plate (4) is confronted gauge block (2) and carried out spacing.
2. the optical fiber acceleration meter of a kind of differential type bigrating structures according to claim 1, it is characterized in that: the outside surface of described two fiber gratings (7) is provided with overlay (8), and the thickness of overlay (8) is 50��100 ��m.
3. the optical fiber acceleration meter of a kind of differential type bigrating structures according to claim 2, it is characterised in that: the overlay (8) of described two fiber grating (7) outside surfaces is polyimide material.
4. the optical fiber acceleration meter of a kind of differential type bigrating structures according to claim 1, it is characterized in that: the position that described two tunable screws (3) are separately fixed on shell (1) and fixing base plate (4) corresponding to quality block (2), and the diameter of tunable screw (3) is greater than the width of the pickup groove installing fiber grating (7) on quality block (2).
5. the optical fiber acceleration meter of a kind of differential type bigrating structures according to Claims 1 to 4 any claim, it is characterised in that: the spacing range between described tunable screw (3) and quality block (2) is 0��0.5mm.
6. the optical fiber acceleration meter of a kind of differential type bigrating structures according to claim 1, it is characterized in that: described fiber grating (7) has carried out prestrain loading when mounted, and adopt bonded adhesives (9) to be fixed at the two ends of fiber grating (7).
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| CN201310712441.XA CN103675340B (en) | 2013-12-20 | 2013-12-20 | The optical fiber acceleration meter of a kind of differential type bigrating structures |
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| CN201310712441.XA CN103675340B (en) | 2013-12-20 | 2013-12-20 | The optical fiber acceleration meter of a kind of differential type bigrating structures |
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| CN103675340A CN103675340A (en) | 2014-03-26 |
| CN103675340B true CN103675340B (en) | 2016-06-01 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104296856B (en) * | 2014-08-20 | 2018-02-23 | 西安石油大学 | Enhanced sensitivity platform optical fiber raster vibration sensor |
| CN105403338A (en) * | 2015-11-04 | 2016-03-16 | 上海大学 | Optical Fiber Pressure Device |
| CN105510631A (en) * | 2016-01-11 | 2016-04-20 | 昆明理工大学 | High-frequency acceleration sensor with optical fiber Bragg gratings and application method of high-frequency acceleration sensor |
| CN105842479A (en) * | 2016-06-03 | 2016-08-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber grating acceleration sensor with integrated differential structure |
| CN109470885B (en) * | 2018-10-19 | 2020-11-24 | 浙江大学 | A monolithic integrated optical accelerometer |
| CN109682523A (en) * | 2019-02-20 | 2019-04-26 | 天津师范大学 | Optical fibre grating acceleration sensor and application for the measurement of stem slamming load |
| CN110133324B (en) * | 2019-06-05 | 2022-05-06 | 华北水利水电大学 | A Differential Fiber Bragg Grating Acceleration Sensing Device |
| CN110221096B (en) * | 2019-07-16 | 2022-04-12 | 蚌埠学院 | A lateral force-based fiber grating accelerometer |
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| US20070193362A1 (en) * | 2006-02-06 | 2007-08-23 | Ferguson Stephen K | Fiber optic strain gage |
| CN100397086C (en) * | 2007-07-09 | 2008-06-25 | 北京信息工程学院 | New Piezoelectric Quartz Accelerometer |
| CN101477138B (en) * | 2009-01-19 | 2011-05-18 | 曹春耕 | Optical fiber grating high-sensitivity accelerometer |
| CN101982740B (en) * | 2010-09-17 | 2011-11-16 | 西北大学 | Optical fiber grating vibration sensor comprising double cantilever beams with equal strength |
| CN202916297U (en) * | 2012-10-23 | 2013-05-01 | 浙江建设职业技术学院 | High-sensitivity FBG acceleration sensor |
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